I am wondering about the Shaker 500 in the 2006 I am ordering. In all the stuff I've read about the new sound systems, I haven't seen any reference to tweeters. I have a 2000 GT now with the Mach 460 with the high mounted tweeters. I know some people trash the Mach but I love it and I can't imagine a high powered sound system without tweeters. What's the deal?